Combustion Research Omega II, Installation, Operating, Maintenance And Parts Manual

Omega II

®

 Installation, Operation & Maintenance 

Combustion Research Corporation 

Page 13 

FLEXIBLE GAS CONNECTOR 

WARNING 

FIRE OR EXPLOSION HAZARD

IMPROPER INSTALLATION, ADJUSTMENT, 
ALTERATION, SERVICE OR MAINTENANCE 
CAN CAUSE DEATH, SEVERE INJURY 
AND/OR PROPERTY DAMAGE.

There Is expansion of the radiant pipe with each firing 
cycle and this will cause the burner to move with 
respect to the gas line.  This can cause an unsafe 
condition if the gas pipe connection is not done in 
strict accordance to the instructions. 

United States - Use only the stainless steel flexible gas 
connector as supplied by Combustion Research 
Corporation.

Canada – Use approved gas connector as outlined in 
B149 Codes; Type 1, minimum 36” long.  See chart 
below for sizing.  This hose is to be supplied by the 
Installer contractor.  

Install the flex connector as shown in the diagram below.  
This gas connector accommodates the normal expansion of 
the system.  Before connecting the gas connector verify 
that all high-pressure testing has been completed. 
The gas connector shut off valve must be parallel to the gas 
inlet on the burner.  A 2” (5cm) cold displacement for initial 
setup is shown.  This displacement may reduce when the 
system is fired. 



  Do not high pressure test the gas piping with the burner 

connected. Failure to follow these instructions can result 
in property damage. 



  Check the pipe and tubing ends for leaks before placing 

heating equipment into service.  When checking for gas 
leaks, use a soap and water solution, never use an 
open flame. The loop of the gas flex MUST BE parallel 
or in line with the gas inlet pipe on the burner. 



  The displacement as shown is for cold, non-firing 

condition.  This displacement will vary as system heats 
up.



  Install drip leg in accordance with all applicable codes.



  EXCESSIVE TORQUE ON THE BURNER GAS INLET 

MANIFOLD MAY CAUSE DAMAGE.  ALWAYS USE 
TWO (2) WRENCHES WHEN MAKING PIPING 
CONNECTIONS TO THE BURNER. 

DO NOT APPLY 

PIPE DOPE TO FLARE NUT FITTINGS OF THE 
FLEXIBLE GAS CONNECTOR.

Gas Connector Description 

Used With Inputs of 

P/N 

½” Flexible Stainless Steel Gas Connector (US Models) – 36” L 

40K through 150K 

0317.01 

¾” Flexible Stainless Steel Gas Connector (US Models) – 36” L 

155K through 200K 

0417.00 

½” Flexible Type 1 Rubber Hose (Canada Only) – 36” L 

40K through 175K 

Supplied by Installer 

¾” Flexible Type 1 Rubber Hose (Canada Only) – 36” L 

180K through 200K 

Supplied by Installer 

INCORRECT POSITIONS 

IMPORTANT: Use two wrenches when connecting gas connector and fittings.

Gas Connector 

Shut-Off Valve

Shut-Off Valve must be parallel to the gas inlet on the burner.  A 2” (5 cm) 
cold displacement for initial setup is shown.  This displacement may 
reduce when the system is fired.

3” (8 cm) – Cold Displacement 

12” 

(30 cm)

Flexible Gas Connector – Form connector into a lazy 
“U” bend as shown.  DO NOT make sharp bends.

!